JPS5627535A - Squelch circuit of fm-am receiver - Google Patents

Squelch circuit of fm-am receiver

Info

Publication number
JPS5627535A
JPS5627535A JP12515479A JP12515479A JPS5627535A JP S5627535 A JPS5627535 A JP S5627535A JP 12515479 A JP12515479 A JP 12515479A JP 12515479 A JP12515479 A JP 12515479A JP S5627535 A JPS5627535 A JP S5627535A
Authority
JP
Japan
Prior art keywords
voltage
circuit
agc
signal
input
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP12515479A
Other languages
Japanese (ja)
Inventor
Hisao Okada
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Sanyo Electric Co Ltd
Original Assignee
Sanyo Electric Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Sanyo Electric Co Ltd filed Critical Sanyo Electric Co Ltd
Priority to JP12515479A priority Critical patent/JPS5627535A/en
Publication of JPS5627535A publication Critical patent/JPS5627535A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03G—CONTROL OF AMPLIFICATION
    • H03G3/00—Gain control in amplifiers or frequency changers
    • H03G3/20—Automatic control
    • H03G3/30—Automatic control in amplifiers having semiconductor devices
    • H03G3/34—Muting amplifier when no signal is present or when only weak signals are present, or caused by the presence of noise signals, e.g. squelch systems

Landscapes

  • Noise Elimination (AREA)

Abstract

PURPOSE:To build in one receiver receiving circuits differing in modulation system, by using a signal obtained by rectifying a noise from an FM detecting circuit when no signal or small input arrives or by using a voltage from an AGC circuit when large input. CONSTITUTION:When no signal or small input arrives, a noise generated in FM detecting circuit 14 is led to active band-pass filter 21 and negatively rectified by diode D3, whose output is applied to the input terminal of squelching switching circuit 24. When large input arrives, on the other hand, fluctuations of an AGC voltage or a voltage fluctuating under the control of the AGC voltage are supplied to transistor Q3, which provides inverted DC amplification and its output positive voltage is applied to the input terminal of squelching switching circuit 24. Thus, the variable range of the squelch operation point is expanded.
JP12515479A 1979-09-27 1979-09-27 Squelch circuit of fm-am receiver Pending JPS5627535A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP12515479A JPS5627535A (en) 1979-09-27 1979-09-27 Squelch circuit of fm-am receiver

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP12515479A JPS5627535A (en) 1979-09-27 1979-09-27 Squelch circuit of fm-am receiver

Related Parent Applications (1)

Application Number Title Priority Date Filing Date
JP10245079A Division JPS5625835A (en) 1979-08-10 1979-08-10 Squelch circuit of fm-am receiver

Publications (1)

Publication Number Publication Date
JPS5627535A true JPS5627535A (en) 1981-03-17

Family

ID=14903202

Family Applications (1)

Application Number Title Priority Date Filing Date
JP12515479A Pending JPS5627535A (en) 1979-09-27 1979-09-27 Squelch circuit of fm-am receiver

Country Status (1)

Country Link
JP (1) JPS5627535A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4580286A (en) * 1984-03-26 1986-04-01 Sprague Electric Company Noise activated mute for FM reception in an AM/FM radio receiver
US4607390A (en) * 1983-06-01 1986-08-19 U.S. Philips Corporation Squelch arrangement for AM/FM radio receiver

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4607390A (en) * 1983-06-01 1986-08-19 U.S. Philips Corporation Squelch arrangement for AM/FM radio receiver
US4580286A (en) * 1984-03-26 1986-04-01 Sprague Electric Company Noise activated mute for FM reception in an AM/FM radio receiver

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